Checking Piston Clearance In Cylinder Bore; Connecting Rod And Piston Assembly; Piston Upside Down - Fiat 850 Sedan 1968 Shop Manual

ENGINE: PISTONS - CONNECTING RODS
37
Fig. 4t.
Connecting rod and piston as-
sembly.
1. Piston pin. - 2. location of
connecting rod-cylinder pairing
number.
Arrows point to the areas where
stock can be milled out to equalize
the weight of pistons and con-
necting rods.
Fig. 40 - Checking pl.ton clearance In cylinder bore.
1. Feeler gauge A. 95316.• 2. Piston.
The same grading applies, of course, also to
pins which should belong to the sarne division as
pistons they are fitted to.
The letter and number showing piston class and
division of pin bore are stamped on the boss base
(fig. 42), while the division of pins
is
stamped on
pin face.
The clearance specified between piston pin and
bosses is .0003" to .0006" (0.008 to 0.QI6 rom).
Fig, 42.
Piston up.ide down,
showing pin bon
base.
C. Class of piston skirt
10 match with cylinder. -
2. Division of piston
boss bore 10 match
with pin,
.umrro
~l UllNElRn S'AUbFfl .URNALI
ordlUllonr
01 RI(ANBIO
mom
6U70 + 6U80
lIl9181 6(,990 + 65.000
(1I918(
65,010 +65.010
~OJ
l -
I:> I' '/
'I
VI
~"\
rJ.ml
L2E!.J
119.970
19.9](
I-
1 19 ,9](
19.978
J
19.978
19,981
I,',," "
,,! ,,, .. ,,.,,
I
~
3.957
3,977
1 19 ,981
19.986
119.986
19.990
319.990
19.99(
Fig. 43 • Critical dimensions (metric)
of
pi,tons, pins and rings,
Numero di ordlnazlone - Part number, • Olametro stantuffi norma
Ii dl r1cambio = Diameter of standard pistons for service.